SLIDING MODE-CONTROLLED QUADRATIC BOOST CONVERTER WITH INTEGRATED PI FOR ROBUST VOLTAGE REGULATION

Abstract

This thesis offers an extensive analysis of a sliding mode-controlled quadratic boost converter (QBC) combined with proportional-integral (PI) compensation to attain resilient voltage regulation in renewable energy and electric car applications. The study focuses on the essential requirement for high-gain DC-DC converters that can effectively convert low input voltages to elevated output levels while ensuring stability over fluctuating load circumstances. The suggested converter topology attains a quadratic voltage gain of Vout=Vin(1−D) ², facilitating 12V-to-48V conversion at a moderate duty cycle, hence substantially diminishing component stress relative to traditional boost converters. A unique two-loop hybrid control technique is devised, incorporating an inner sliding mode controller for accurate inductor current regulation and an outside PI controller for output voltage tracking. This setup guarantees swift disturbance rejection during load fluctuations (25-75% load steps) while keeping output voltage deviation under 2%. The study utilizes state-space averaging methods to create precise dynamic models and get transfer functions essential for controller design. Comprehensive simulations confirm the converter's efficacy, exhibiting output ripple below 5%, 93% efficiency at full load, and enhanced transient response relative to traditional control techniques. The project encompasses comprehensive design approaches for inductors and capacitors functioning at a switching frequency of 50kHz. Experimental validation substantiates the converter's resilience to input voltage fluctuations (12V-30V) and load perturbations, rendering it appropriate for photovoltaic systems, electric vehicle charging infrastructure, and DC microgrids. The thesis offers substantial progress in high-gain converter topologies and resilient control mechanisms, establishing a basis for future sustainable energy systems.